Modulating Residual Lead Iodide via Functionalized Buried Interface for Efficient and Stable Perovskite Solar Cells
Modulating Residual Lead Iodide via Functionalized Buried Interface for Efficient and Stable Perovskite Solar Cells
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DOI：
10.1021/acsenergylett.2c02378
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发表时间：
2022-12
影响因子：
22
通讯作者：
Chunyan Deng;Jihuai Wu;Yuqian Yang;Yitian Du;Ruoshui Li;Qi Chen;Yuanxian Xu;Weihai Sun;Z. Lan;Peng Gao
中科院分区：
文献类型：
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作者：
Chunyan Deng;Jihuai Wu;Yuqian Yang;Yitian Du;Ruoshui Li;Qi Chen;Yuanxian Xu;Weihai Sun;Z. Lan;Peng Gao
钙钛矿膜中足够的碘化铅（PbI 2）有效地钝化缺陷并增强器件性能。然而，过量的大晶粒PbI 2团簇倾向于随机分布在钙钛矿层中，这减轻了PbI 2的积极作用。本文首先通过对4，4 ′-二氨基二苯砜氢碘酸盐（DDSI 2）的埋层界面进行功能化修饰，来调控PbI 2团簇的分布和尺寸.作为一种多功能改性剂，DDSI 2可以优化氧化锡（SnO 2）的能级，并通过−NH3+和S O官能团钝化掩埋界面缺陷。DDSI 2与钙钛矿之间的氢键和配位作用延缓了晶体生长速率，减轻了晶格应力，从而改善了钙钛矿的质量，调节了PbI 2的分布。因此，DDSI 2改性的器件显示出24.10%的功率转换效率和1800小时的存储稳定性。我们展示了一种独特的策略，合理控制PbI 2的高效和稳定的钙钛矿太阳能电池。
Sufficient lead iodide (PbI2) in perovskite films effectively passivates defects and enhances device performance. However, excess large-grained PbI2clusters tend to be randomly distributed in the perovskite layer, which mitigate the positive effect of the PbI2. Here, we first modulated the distribution and size of PbI2clusters by functionalizing the buried interface of 4,4′-diaminodiphenyl sulfone hydroiodide (DDSI2). As a multifunctional modifier, DDSI2can optimize the energy level of tin oxide (SnO2) and passivate the buried interface defects via −NH3+and S═O functional groups. Moreover, the hydrogen bonding and coordination between DDSI2and perovskite retard the crystal growth rate and alleviate the lattice stress, thereby improving the quality of the perovskite and modulating the distribution of PbI2. Consequently, the DDSI2-modified device displays a power conversion efficiency of 24.10% and a storage stability of 1800 h. We demonstrate a unique strategy for the rational control of PbI2for efficient and stable perovskite solar cells.